Return to the home page...

Go Back   Moyer Marine Atomic 4 Community - Home of the Afourians > Discussion Topics > General Interest

Reply
 
Thread Tools Display Modes
  #1   IP: 74.110.198.83
Old 04-20-2011, 08:59 PM
ILikeRust's Avatar
ILikeRust ILikeRust is offline
Afourian MVP
 
Join Date: Sep 2010
Location: Henrico, VA
Posts: 2,141
Ball valve - does flow direction matter?

Thanks to Maine Sail's excellent tutorial on replacing through-hulls, I soon will be doing this job per his instructions.

As he recommends, I bought the Groco flanged adapter and ball valve and a bronze "mushroom" through-hull fitting.

The valve I bought is the same as the one shown here.

I notice that the valve body is not symmetrical in its construction - it appears that it can be disassembled. This leads me to suspect that it might be designed to have the water flow through it in one direction only - although there is no arrow or other marking on it to indicate this.

So - anybody know whether it matters? I've done a little Googling of the issue, and evidently there are some ball valves that are in fact unidirectional. I just need to know if this is one of them - and if so, which way does the flow have to go?

Thanks!
__________________
- Bill T.
- Richmond, VA

Q: How many politically-correct people does it take to screw in a light bulb?

A: Look, I don't know, but that's not funny.
Reply With Quote
  #2   IP: 72.39.47.23
Old 04-20-2011, 09:22 PM
gosolar gosolar is offline
Member
 
Join Date: Apr 2011
Posts: 2
Ball Valves

From what I see in the pic this valve has a drain screw. It should be mounted so that whatever the valve controls can be drained. Going back to the pic it is mounted in the correct position. If it is at all possible put the drain screw at the bottom or to either side. eg. If the valve is on the water system and you need to work on it then it can be drained without having to remove the hoses from the valve.
Reply With Quote
  #3   IP: 174.252.102.186
Old 04-20-2011, 09:39 PM
jstaff jstaff is offline
Senior Member
 
Join Date: Oct 2004
Location: CT
Posts: 58
There are ball valves that release the pressure form the downstream side when closed, but besides that, I'm not familiar with there being a flow direction. What you see as being able to be "disassembled" is just part of its machining and assembly. I've never know of there being any reworking of ball valves. Large globe and gate valves are rebuilt routinely.

Since the ball valve is not intended to be "throttled" or adjusted (like a globe valve) flow direction is not an issue.
Reply With Quote
  #4   IP: 74.110.198.83
Old 04-20-2011, 09:46 PM
ILikeRust's Avatar
ILikeRust ILikeRust is offline
Afourian MVP
 
Join Date: Sep 2010
Location: Henrico, VA
Posts: 2,141
Yup, I realized after posting this that the drain screw is the key.

Here is the page from the Groco on-line catalog showing this valve assembled to the flanged adapter.

I figure if the catalog shows it mounted that way, that must be the correct orientation. But I also note that this is the reverse of how Maine Sail shows it mounted.
__________________
- Bill T.
- Richmond, VA

Q: How many politically-correct people does it take to screw in a light bulb?

A: Look, I don't know, but that's not funny.
Reply With Quote
  #5   IP: 174.252.102.186
Old 04-20-2011, 10:05 PM
jstaff jstaff is offline
Senior Member
 
Join Date: Oct 2004
Location: CT
Posts: 58
The nice thing about not having a drain is that you don't need to worry about the plug...

Usually on a pleasure boat you need to drain the entire line anyway.

I would have the drain to the inboard side. If it fails you only have the contents of your system to leak out; instead of the raw water sinking your boat.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Bypass Valve, Thermostat Question rpowers Cooling System 14 03-15-2011 04:10 PM
Do I have to pull my A-4 ??? Laker General Interest 18 10-07-2010 08:45 PM
valve removal JarrettF Overhaul 5 05-26-2008 08:03 PM
Polishing Filter Flow direction eriew Fuel System 0 07-02-2007 12:02 PM
Broken valve stem stuck in the valve guide Unregistered General Maintenance 1 11-19-2005 07:26 AM


All times are GMT -5. The time now is 04:31 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.


Universal® is a registered trademark of Westerbeke Corporation

Copyright © 2004-2014 Moyer Marine Inc.

All Rights Reserved